Fix missing return for special ankiAddTagToNote endpoint.

[matgrioni]

Purpose / Description

Add missing return for new ankiAddTagToNote API which otherwise will not forward the right parameters to the underlying server.

How Has This Been Tested?

No extra testing.

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First PR! 🚀 We sincerely appreciate that you have taken the time to propose a change to AnkiDroid! Please have patience with us as we are all volunteers - we will get to this as soon as possible.

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